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Might be okay if you're starting out but the accuracy/readability of this unit is questionable. While it is likely accurate enough, the screen provides a very vague reading. Once you have your guitar "in tune" you could tune any string 5-10 cents sharp or flat and you'll get no response from this thing. It's also very fragile and the rear of the ball joint is covered in some ominous gunk. A below average product uplifted by an exceptional marketing strategy.
I loved how easy this was to clip on to my guitar and it worked right away! I didnt have to fiddle around with any buttons. I hit the power button and strummed a string and the display immediately showed me when I was exactly on note! I am so glad this is so easy to use!